I can`t find the references in the researchsubject files- i want to change the tier lab requirements and i would like to change how the requirements are calculated..

I want to make a new chain under "LOGISTICS" where each tier unlocks logistical bonuses, but that would mean altering the tier level prerequisites from "labs" to "starbases".

Since i can`T find any way to alter how many labs you need to research something, i`m guessing this part is hardcoded and impossible to change???